XK140 Easy way for replacing air demister hose(air duct)

In my OTS XK140 i have an old air hose to the window demisters(air duct).
I want to replace the old hose because it is cracked so bought a replacement.
Before i pulled out the old hose i felt if i could reach the demister(air duct), but my hands where to big.
What is the easiest way to replace those hoses and if there is no easy way, what is the best way?

(and yes I’m being serious here) - Can you employ a child or maybe wife/girlfriend with smaller hands than yours to help out here?

And don’t forget to disconnect the battery. I got a nasty burn when my metal watch touched a live terminal behind the dash.

Yep; been there, done that.:anguished: I now use rubber battery lug covers over the Ammeter terminals.